1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/drivers/mmc/host/sdhci_f_sdh30.c 4 * 5 * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd 6 * Vincent Yang <vincent.yang@tw.fujitsu.com> 7 * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org> 8 */ 9 10#include <linux/acpi.h> 11#include <linux/err.h> 12#include <linux/delay.h> 13#include <linux/module.h> 14#include <linux/of.h> 15#include <linux/property.h> 16#include <linux/clk.h> 17 18#include "sdhci-pltfm.h" 19#include "sdhci_f_sdh30.h" 20 21struct f_sdhost_priv { 22 struct clk *clk_iface; 23 struct clk *clk; 24 u32 vendor_hs200; 25 struct device *dev; 26 bool enable_cmd_dat_delay; 27}; 28 29static void *sdhci_f_sdhost_priv(struct sdhci_host *host) 30{ 31 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 32 33 return sdhci_pltfm_priv(pltfm_host); 34} 35 36static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) 37{ 38 struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); 39 u32 ctrl = 0; 40 41 usleep_range(2500, 3000); 42 ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); 43 ctrl |= F_SDH30_CRES_O_DN; 44 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 45 ctrl |= F_SDH30_MSEL_O_1_8; 46 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 47 48 ctrl &= ~F_SDH30_CRES_O_DN; 49 sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2); 50 usleep_range(2500, 3000); 51 52 if (priv->vendor_hs200) { 53 dev_info(priv->dev, "%s: setting hs200\n", __func__); 54 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 55 ctrl |= priv->vendor_hs200; 56 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL); 57 } 58 59 ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); 60 ctrl |= F_SDH30_CMD_CHK_DIS; 61 sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING); 62} 63 64static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) 65{ 66 return F_SDH30_MIN_CLOCK; 67} 68 69static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) 70{ 71 struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); 72 u32 ctl; 73 74 if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) 75 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL); 76 77 sdhci_reset(host, mask); 78 79 if (priv->enable_cmd_dat_delay) { 80 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); 81 ctl |= F_SDH30_CMD_DAT_DELAY; 82 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL); 83 } 84} 85 86static const struct sdhci_ops sdhci_f_sdh30_ops = { 87 .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, 88 .get_min_clock = sdhci_f_sdh30_get_min_clock, 89 .reset = sdhci_f_sdh30_reset, 90 .set_clock = sdhci_set_clock, 91 .set_bus_width = sdhci_set_bus_width, 92 .set_uhs_signaling = sdhci_set_uhs_signaling, 93}; 94 95static const struct sdhci_pltfm_data sdhci_f_sdh30_pltfm_data = { 96 .ops = &sdhci_f_sdh30_ops, 97 .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC 98 | SDHCI_QUIRK_INVERTED_WRITE_PROTECT, 99 .quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE 100 | SDHCI_QUIRK2_TUNING_WORK_AROUND, 101}; 102 103static int sdhci_f_sdh30_probe(struct platform_device *pdev) 104{ 105 struct sdhci_host *host; 106 struct device *dev = &pdev->dev; 107 int ctrl = 0, ret = 0; 108 struct f_sdhost_priv *priv; 109 struct sdhci_pltfm_host *pltfm_host; 110 u32 reg = 0; 111 112 host = sdhci_pltfm_init(pdev, &sdhci_f_sdh30_pltfm_data, 113 sizeof(struct f_sdhost_priv)); 114 if (IS_ERR(host)) 115 return PTR_ERR(host); 116 117 pltfm_host = sdhci_priv(host); 118 priv = sdhci_pltfm_priv(pltfm_host); 119 priv->dev = dev; 120 121 priv->enable_cmd_dat_delay = device_property_read_bool(dev, 122 "fujitsu,cmd-dat-delay-select"); 123 124 ret = mmc_of_parse(host->mmc); 125 if (ret) 126 goto err; 127 128 if (dev_of_node(dev)) { 129 sdhci_get_of_property(pdev); 130 131 priv->clk_iface = devm_clk_get(&pdev->dev, "iface"); 132 if (IS_ERR(priv->clk_iface)) { 133 ret = PTR_ERR(priv->clk_iface); 134 goto err; 135 } 136 137 ret = clk_prepare_enable(priv->clk_iface); 138 if (ret) 139 goto err; 140 141 priv->clk = devm_clk_get(&pdev->dev, "core"); 142 if (IS_ERR(priv->clk)) { 143 ret = PTR_ERR(priv->clk); 144 goto err_clk; 145 } 146 147 ret = clk_prepare_enable(priv->clk); 148 if (ret) 149 goto err_clk; 150 } 151 152 /* init vendor specific regs */ 153 ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); 154 ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | 155 F_SDH30_AHB_INCR_4; 156 ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); 157 sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG); 158 159 reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); 160 sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 161 msleep(20); 162 sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); 163 164 reg = sdhci_readl(host, SDHCI_CAPABILITIES); 165 if (reg & SDHCI_CAN_DO_8BIT) 166 priv->vendor_hs200 = F_SDH30_EMMC_HS200; 167 168 if (!(reg & SDHCI_TIMEOUT_CLK_MASK)) 169 host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK; 170 171 ret = sdhci_add_host(host); 172 if (ret) 173 goto err_add_host; 174 175 return 0; 176 177err_add_host: 178 clk_disable_unprepare(priv->clk); 179err_clk: 180 clk_disable_unprepare(priv->clk_iface); 181err: 182 sdhci_pltfm_free(pdev); 183 184 return ret; 185} 186 187static int sdhci_f_sdh30_remove(struct platform_device *pdev) 188{ 189 struct sdhci_host *host = platform_get_drvdata(pdev); 190 struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); 191 struct clk *clk_iface = priv->clk_iface; 192 struct clk *clk = priv->clk; 193 194 sdhci_pltfm_unregister(pdev); 195 196 clk_disable_unprepare(clk_iface); 197 clk_disable_unprepare(clk); 198 199 return 0; 200} 201 202#ifdef CONFIG_OF 203static const struct of_device_id f_sdh30_dt_ids[] = { 204 { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, 205 { /* sentinel */ } 206}; 207MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); 208#endif 209 210#ifdef CONFIG_ACPI 211static const struct acpi_device_id f_sdh30_acpi_ids[] = { 212 { "SCX0002" }, 213 { /* sentinel */ } 214}; 215MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); 216#endif 217 218static struct platform_driver sdhci_f_sdh30_driver = { 219 .driver = { 220 .name = "f_sdh30", 221 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 222 .of_match_table = of_match_ptr(f_sdh30_dt_ids), 223 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), 224 .pm = &sdhci_pltfm_pmops, 225 }, 226 .probe = sdhci_f_sdh30_probe, 227 .remove = sdhci_f_sdh30_remove, 228}; 229 230module_platform_driver(sdhci_f_sdh30_driver); 231 232MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver"); 233MODULE_LICENSE("GPL v2"); 234MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD."); 235MODULE_ALIAS("platform:f_sdh30"); 236